not really a mountain range, more some hills and crater rows, and the Bláfjöll mountain massif. The system includes two shield volcanoes, Heiðin há and Leitin. Among the many smaller subglacial mounds, tuyas, craters and eruptive vents are Stóra-Kóngsfell, Drottning, the Þríhnúkagígar crater trio – now famous because it is possible to see a magmatic feeder system from the inside -, and some craters named Eldborg (e.g. Eldborg í Bláfjöllum and Stóra-Eldborg undir Geitahlíð). The rootless cones of Rauðhólar near Reykjavík are also connected to a lava flow from this volcanic system. Nature protection in Brennisteinsfjöll Some protected areas are to be found in the region of Brennisteinsfjöll. These are Herdísarvík Nature Reserve, Reykjanes Country Park, Bláfjöll Country Park and the two Natural Monuments Eldborgir undir Geitahlíð and Eldborg í Bláfjöllum. See also Geology of Reykjanes Peninsula Krýsuvík (volcanic system) External links Volcanism of Brennisteinsfjöll Brennsteinsfjöll in the Catalogue of Icelandic Volcanoes Huang Maochang: Possible environmental impacts of drilling exploratory wells for geothermal development in the Brennisteinsfjöll area, SW-Iceland. United National University. Geothermal Training Programme. Reports 2001, no.5. Volcano monitoring https://en.vedur.is/earthquakes-and-volcanism/earthquakes/reykjanespeninsula/ Icelandic Met Office (IMO). Earthquake Monitoring. Reykjanes Peninsula https://en.vedur.is/earthquakes-and-volcanism/volcanic-eruptions/ IMO. Aviation Color Code References Volcanoes of Iceland VEI-2 volcanoes Reykjanes Volcanic systems of Iceland Reykjanes Volcanic Belt Brennisteinsfjöll Volcanic System